The differential has new ring and pinion gears, new bearings, and new bushings.  The slave cylinders are installed and new master cylinders up front for the steering.
The Bombardier differential was too wide, so I had to put the sprockets on the inside of the backer plates.  I just need to find one more bogey wheel hub to complete the track assembly.
As soon as I get that last hub, a trailer, and some snow, I'll be able to test her out!